Insulin sensitivity and insulin binding to monocytes in maturity-onset diabetes

The Journal of Clinical Investigation
R A DeFronzoV R Soman

Abstract

Tissue sensitive to insulin and insulin binding to monocytes were evaluated in 15 nonobese maturity-onset diabetics and in 16 healthy controls. Insulin sensitivity was determined by the insulin clamp technique in which the plasma insulin is acutely raised and maintained 100 muU/ml above the fasting level and plasma glucose is held constant at fasting levels by a variable glucose infusion. The amount of glucose infused is a measure of overall tissue sensitivity to insulin. In the diabetic group, the fasting plasma glucose concentration (168+/-4 mg/dl) was 85% greater than controls (P < 0.01) whereas the plasma insulin level (15+/-1 muU/ml) was similar to controls. During the insulin clamp study, comparable plasma insulin levels were achieved in the diabetics (118+/-5) and the controls (114+/-5 muU/ml). However, the glucose infusion rate in the diabetics (4.7+/-0.4 mg/kg.min) was 30% below controls (P < 0.01). Among the diabetics, the glucose infusion rate correlated directly with the fasting plasma glucose level (r = 0.57, P < 0.05). In five diabetic subjects, glucose metabolism was similar to controls, and these diabetics had the highest fasting glucose levels. When they were restudied after prior normalization (with insulin) o...Continue Reading

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